CN215835209U - Motor core, positioning device for iron core riveting and iron core riveting die - Google Patents

Abstract

The utility model discloses a motor iron core, a positioning device for iron core riveting and an iron core riveting die, belongs to the field of iron core riveting equipment, and aims to improve the production efficiency and precision of the motor iron core. The inner ring of the yoke part in each iron core block of the motor iron core is provided with a positioning groove; and indexing slots are formed between adjacent inner yoke portions. The positioning device for riveting the iron core is characterized in that the inner ring positioning device comprises a positioning block corresponding to the positioning groove and an indexing block corresponding to the indexing groove, the positioning block is inserted into the positioning groove, and the indexing block is inserted into the indexing groove to position the inner ring of the iron core of the motor; the outer ring positioning device surrounds the center of the positioning seat through the expansion clamping block to enclose the motor iron core to carry out outer ring positioning, so that the roundness of the motor iron core is ensured, and the precision is improved. Iron core riveting die, including the iron core with positioner and with a plurality of pressure heads that motor core splice corresponds, and fold the uniformity of riveting good, the risk of damage motor core when having reduced the riveting does benefit to the precision and the production efficiency that improve motor core.

Description

Motor core, positioning device for iron core riveting and iron core riveting die

Technical Field

The utility model belongs to the field of iron core riveting equipment, and particularly relates to a motor iron core, a positioning device for iron core riveting and an iron core riveting die.

Background

The motor stator core is formed by laminating and riveting punching sheets. The traditional punching sheet is of an integrally formed whole-circle structure and is wound on a stator core provided with an insulating medium through internal winding. The integrally formed punching sheet brings difficulty to winding. In order to avoid the problem of difficult winding of the traditional stator core, a hinge type stator core appears, for example, the patent application with the application number of CN201720595609.7 and the name of hinge type stator core and a forming die thereof, the disclosed stator core is characterized in that an iron core body is formed by splicing a plurality of iron core blocks with the same structure end to end, a boss is arranged on the left end face of each iron core block, a groove is arranged on the right end face of each iron core block, and the plurality of iron core blocks are spliced into an annular iron core through interference fit of the boss on one iron core block and the groove on the other iron core block. This stator core, when adjacent iron core piece concatenation, the cooperation automatic positioning between a boss and the recess, positioning effect is poor, is difficult to guarantee the circularity of the stator core who pieces together.

When the iron core blocks of the conventional stator iron core are spliced at the beginning, the stator iron core is usually positioned from the middle part of the stator iron core by a positioning seat, and then the stator iron core is fixed on the positioning seat by pressing down the top of the stator iron core by a pressing block; the bosses in the adjacent iron core blocks are pressed down one by the pressure head on the upper part, and the bosses are pressed down in the grooves to complete splicing. In the mode, because the splicing positions of the adjacent iron core blocks are pressed down for multiple times, the working procedures are multiple, and the production efficiency is low; the stator core is easy to damage; and the precision of the spliced product is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of poor positioning effect of the existing motor iron core, and provides a motor iron core which is beneficial to rivet-overlapping positioning; aiming at the problems of multiple iron core block splicing procedures and low precision, the iron core riveting die is provided, and the production efficiency and the product precision of the motor iron core are improved.

The technical scheme adopted by the utility model is as follows: the motor iron core is formed by sequentially splicing N iron core blocks at the head; each iron core block is arc-shaped, a splicing groove is formed in one end of each iron core block along the radial direction of the iron core block, and a splicing boss matched with the splicing groove is formed in the other end of each iron core block; the N iron core blocks are inserted into the splicing grooves through the splicing bosses and spliced into a circular ring shape; each iron core block comprises a connecting tooth, and an arc outer yoke part and an arc inner yoke part which are concentric; the outer end of the connecting tooth is connected with the inner ring of the outer yoke part, and the inner end of the connecting tooth is connected with the outer ring of the inner yoke part; the splicing grooves and the splicing bosses are arranged on the outer yoke part; the inner ring of the inner yoke part of each iron core block is provided with a positioning groove which is sunken outwards along the radial direction of the inner ring; and an indexing groove is formed between the adjacent inner yoke parts of the two adjacent iron core blocks.

Furthermore, two adjacent iron core blocks are spliced to surround and form a trapezoidal cavity, and the indexing groove penetrates from the inner ring of the inner yoke part to the cavity.

The positioning device for riveting the iron core comprises an inner ring positioning device for limiting the inner ring of the positioning iron core and an outer ring positioning device for limiting the outer ring of the positioning iron core;

the inner ring positioning device comprises a positioning seat, N positioning blocks corresponding to the positioning grooves of the motor iron core and N indexing blocks corresponding to the indexing grooves of the motor iron core; the N positioning blocks are distributed on the positioning seat around the center of the positioning seat, and the positioning blocks are matched with the positioning grooves; the N indexing blocks are distributed on the positioning seat around the center of the positioning seat, and the indexing blocks are matched with the indexing grooves; the positioning blocks and the indexing blocks are arranged at intervals;

the outer ring positioning device comprises a plurality of expansion clamping blocks, the inner end of each expansion clamping block is provided with an arc-shaped groove, the arc-shaped groove on each expansion clamping block surrounds the center of the positioning seat to form a circular limiting groove matched with the outer ring of the motor iron core, and a limiting mechanism for limiting the relative position of each expansion clamping block is arranged.

Furthermore, the positioning block is detachably arranged on the positioning seat; the indexing block is detachably arranged on the positioning seat.

Furthermore, first slots matched with the positioning blocks are uniformly distributed on the positioning seat along the circumferential direction of the positioning seat, and the positioning blocks are inserted into the first slots; the positioning seat is uniformly distributed with a second slot matched with the indexing block along the annular direction of the positioning seat, and the indexing block is inserted into the second slot; the first slot and the second slot are distributed at intervals.

Furthermore, the two expansion clamping blocks are respectively arranged on two sides of the positioning seat.

Furthermore, a guide rail corresponding to the expansion clamping block is arranged, a guide groove matched with the guide rail is arranged at the bottom of the expansion clamping block, and the guide groove of the expansion clamping block is in sliding fit with the guide rail along the extension direction of the guide rail.

Furthermore, the limiting mechanisms are clamps respectively connected to the outer ends of the expansion clamping blocks.

The iron core riveting die comprises an upper die base, a lower die base, a guide pillar, a press riveting device and the positioning device for iron core riveting;

the guide post is vertically arranged on the lower die base;

the upper die holder is provided with a guide sleeve matched with the guide pillar; the top end of the guide post is inserted into the guide sleeve, and the guide post and the guide sleeve are in movable fit along the axial direction of the guide post.

The riveting device comprises a fixing plate and a plurality of pressing heads arranged around the center of the fixing plate;

the fixed plate is detachably mounted on the upper die base, the positioning seat of the positioning device for iron core riveting is detachably mounted on the lower die base, and the center of the fixed plate is aligned with the center of the positioning seat.

Furthermore, the pressure head is a stepped shaft and comprises a riveting part with the diameter reduced at the bottom along the axial direction of the pressure head, and the end face of the riveting part is in a reticulate pattern shape.

The utility model has the beneficial effects that: according to the motor iron core disclosed by the utility model, the positioning groove is formed in the inner ring of the inner yoke part, so that the positioning in the inner ring of the motor iron core is facilitated, the inward deviation of the iron core block along the motor iron core is avoided, and the roundness of the inner ring of the motor iron core is favorably ensured. Through the arrangement of the indexing grooves, the angle relation between two adjacent iron core blocks can be limited by inserting the indexing blocks into the indexing grooves, so that the roundness of the motor iron core spliced by N iron core blocks is ensured.

This positioner is used in iron core riveting, through inner circle positioner and outer lane positioner's setting, radially fix a position motor core by the inboard and outboard along motor core, avoided traditional upper and lower locate mode to have the risk of disturbing to the pressure head for the accessible pressure head once only pushes down the concatenation of accomplishing all iron core pieces, does benefit to and improves production efficiency. And the positioning is carried out along the inner side and the outer side of the radial direction, so that the roundness of the motor iron core is ensured, and the precision of the motor iron core is improved.

According to the iron core riveting die, the radial inner side and the radial outer side of the motor iron core are positioned through the positioning device, the pressing head which is equal to the iron core block is aligned with the splicing boss of the corresponding iron core block, and meanwhile, the splicing boss is pressed into the corresponding splicing groove by pressing, so that the consistency is good, the risk of damaging the motor iron core during riveting is reduced, and the service life of the motor iron core is prolonged; the precision of the motor iron core is improved; and the production efficiency can be greatly improved.

Drawings

FIG. 1 is a view showing a structure of a riveting die for an iron core;

FIG. 2 is a cut-away view of an iron core riveting die;

FIG. 3 is a schematic diagram of a motor core;

FIG. 4 is a schematic diagram of a core block;

FIG. 5 is a schematic view of the expanding and clamping block;

FIG. 6 is a schematic view of a guide rail;

fig. 7 is a structure diagram of the positioning seat.

In the figure, a lower die holder 1, a tensioning clamp block 2, an arc-shaped groove 2A, a guide groove 2B, a pressure head 3, a fixed plate 4, an upper die holder 5, a guide post 6, a guide sleeve 7, a positioning seat 8, a first slot 8A, a second slot 8B, a clamp 9, a guide rail 10, a clamp seat 11, a positioning block 12, an indexing block 13, a core block A, an outer yoke A1, an inner yoke A2, a connecting tooth A3, a splicing groove A4, a splicing boss A5, a positioning groove A6, an indexing groove A7, a cavity A8, an inner hexagonal cylindrical head screw B1 and a cylindrical pin B2.

Detailed Description

The utility model is further described below with reference to the following figures and examples:

as shown in fig. 3 and 4, the motor core is formed by sequentially splicing N core blocks a at the head; each iron core block A is arc-shaped, a splicing groove A4 is formed in one end of each iron core block A along the radial direction of the iron core block A, and a splicing boss A5 matched with the splicing groove A4 is formed in the other end of each iron core block A; the N iron core blocks A are inserted into the splicing groove A4 through the splicing boss A5 and spliced into a circular ring shape; each iron core block A comprises a connecting tooth A3, a concentric arc-shaped outer yoke part A1 and an arc-shaped inner yoke part A2; the outer end of the connecting tooth A3 is connected with the inner ring of the outer yoke A1, and the inner end is connected with the outer ring of the inner yoke A2; the splicing groove A4 and the splicing boss A5 are both arranged on the outer yoke A1; a positioning groove A6 which is recessed outwards along the radial direction is arranged on the inner ring of the inner yoke part A2 of each iron core block A; and an indexing groove A7 is formed between the adjacent inner yoke parts A2 of the two adjacent core blocks A.

According to the motor iron core disclosed by the utility model, the positioning groove A6 is formed in the inner ring of the inner yoke part A2, so that the positioning in the inner ring of the motor iron core is facilitated, the inward deviation of the iron core block A along the motor iron core is avoided, and the roundness of the inner ring of the motor iron core is favorably ensured. Through the arrangement of the dividing groove A7, the angular relationship between two adjacent iron core blocks A can be limited by inserting the dividing block 13 into the dividing groove A7, so that the roundness of the motor iron core spliced by the N iron core blocks A is ensured.

The dividing groove a7 may be a structure with a closed outer end and an open inner end, however, in this structure, when the core block a is molded, steps are required to be arranged at both ends of the inner yoke portion a2 along the radial direction thereof, so that the difficulty in manufacturing the core block a is increased, in order to overcome this problem, preferably, two adjacent core blocks a are spliced to enclose the cavity A8 in a trapezoidal shape, and the dividing groove a7 penetrates from the inner ring of the inner yoke portion a2 to the cavity A8.

The positioning device for riveting the iron core comprises an inner ring positioning device for limiting the inner ring of the positioning iron core and an outer ring positioning device for limiting the outer ring of the positioning iron core as shown in figure 1 or figure 2;

the inner ring positioning device comprises a positioning seat 8, N positioning blocks 12 corresponding to a positioning groove A6 of the motor iron core and N indexing blocks 13 corresponding to an indexing groove A7 of the motor iron core; the N positioning blocks 12 are distributed on the positioning seat 8 around the center of the positioning seat 8, and the positioning blocks 12 are matched with the positioning grooves A6; the N indexing blocks 13 surround the center of the positioning seat 8 and are distributed on the positioning seat 8, and the indexing blocks 13 are matched with the indexing grooves A7; the positioning block 12 and the indexing block 13 are arranged at intervals;

the outer ring positioning device comprises a plurality of expansion clamping blocks 2, the inner end of each expansion clamping block 2 is provided with an arc-shaped groove 2A, the arc-shaped groove 2A on each expansion clamping block 2 surrounds the center of the positioning seat 8 to form a circular limiting groove matched with the outer ring of the motor iron core, and a limiting mechanism for limiting the relative position of each expansion clamping block 2 is arranged.

According to the utility model, the positioning seat 8 is used for placing N iron core blocks A of the motor iron core, the positioning blocks 12 are installed on the positioning seat 8, the positioning blocks 12 correspond to the positioning grooves A6 of the motor iron core, which means that the number of the positioning blocks 12 is consistent with that of the positioning grooves A6, the relative positions of the positioning blocks 12 are consistent with that of the positioning grooves A6, and when the centers of the positioning blocks 12 and the positioning seat 8 are centered, the positioning blocks 12 can be centered with the corresponding positioning grooves A6 one by one; the positioning block 12 is adapted to the positioning groove a6, which means that the size of the positioning block 12 can meet the requirement of inserting and matching with the positioning groove a6, so that the positioning block 12 can be correctly placed on the positioning seat 8 after the positioning groove a6 of each positioning block 12 is inserted and connected with the positioning block 12.

The indexing slot a7 of the motor iron core corresponds to the N indexing blocks 13. The indexing block 13 is inserted into the indexing groove A7, so that the included angle between two adjacent iron core blocks A can be ensured, and the problem of staggering along the annular direction is avoided.

The positioning block 12 is inserted into the positioning groove A6, the indexing block 13 is inserted into the indexing groove A7, and the N iron core blocks A are enclosed into a complete ring, so that the accuracy of the positions of the iron core blocks A along the ring is ensured;

the positioning seat 8 is arranged in a cylindrical manner, and the circular outer wall of the positioning seat radially limits the inner ring of the motor iron core; the groove wall of the arc-shaped groove 2A of the expansion clamping block 2 surrounds the periphery of the motor iron core, and the outer ring of the motor iron core is limited along the radial direction; the roundness and coaxiality precision of the inner ring and the outer ring of the motor iron core are improved.

This positioner is used in iron core riveting radially fixes a position motor core by the inboard outside along motor core, has avoided traditional upper and lower locate mode to have the risk of interference to the pressure head for the accessible pressure head once only pushes down the concatenation of accomplishing all iron core blocks A, does benefit to improvement production efficiency. And the positioning is carried out along the inner side and the outer side of the radial direction, so that the roundness of the motor iron core is ensured, and the precision of the motor iron core is improved.

In order to adapt to different types of motor cores, preferably, as shown in fig. 7, slots i 8A adapted to the positioning blocks 12 are uniformly distributed on the positioning seat 8 along the circumferential direction thereof, and the positioning blocks 12 are inserted into the slots i 8A; a second slot 8B matched with the indexing block 13 is uniformly distributed on the positioning seat 8 along the circumferential direction of the positioning seat, and the indexing block 13 is inserted into the second slot 8B; the first slot 8A and the second slot 8B are distributed at intervals. The positioning block 12 can be detachably arranged on the positioning seat 8; and the index block 13 is detachably mounted to the positioning seat 8. The positioning block 12, the positioning seat 8 and the indexing block 13 can be replaced conveniently, so that the positioning seats 8 with different specifications can be replaced according to the types of the motor iron cores.

The expansion clamping block 2 can be three, four or the like, but in order to simplify the overall structure of the positioning device, it is preferable that the expansion clamping block 2 has two blocks which are separated from the two sides of the positioning seat 8. Two clamp splice 2 that rise can satisfy the outer lane location demand, and only need lock the position of two clamp splice 2 that rise, stop gear obtains simplifying, and the control rises the constant head tank A6 of clamp splice 2 and piece together the circular spacing groove coaxial with positioning seat 8 and operate more easily.

In order to ensure that the expansion clamping block 2 moves along the fixed direction and improve the positioning accuracy and positioning efficiency of the expansion clamping block 2, it is preferable that, as shown in fig. 5, a guide rail 10 corresponding to the expansion clamping block 2 is provided, a guide groove 2B adapted to the guide rail 10 is provided at the bottom of the expansion clamping block 2, and the guide groove 2B of the expansion clamping block 2 is in sliding fit with the guide rail 10 along the extending direction of the guide rail 10. The guide rail 10 may be i-shaped and may be T-shaped as shown in fig. 6.

The limiting mechanism can be a hydraulic cylinder or a gear rack structure, and in order to realize quick positioning, preferably, the limiting mechanism is a clamp 9 respectively connected to the outer ends of the expansion clamping blocks 2. The opposite end of the arc-shaped groove 2A arranged on the expansion clamping block 2 is the outer end of the expansion clamping block 2. The clamp 9 is tightened, and the expansion clamping block 2 can be pushed to move along the guide rail 10 close to the positioning seat 8; the clamp 9 is loosened, and the expanding and clamping block 2 can be driven to reset along the guide rail 10.

An iron core riveting die, as shown in fig. 1 or fig. 2, comprises an upper die holder 5, a lower die holder 1, a guide pillar 6, a press riveting device and a positioning device for iron core riveting;

the guide post 6 is vertically arranged on the lower die holder 1;

the upper die holder 5 is provided with a guide sleeve 7 matched with the guide post 6; the top end of the guide post 6 is inserted into the guide sleeve 7, and the guide post 6 and the guide sleeve 7 are in movable fit along the axial direction of the guide post 6.

The riveting device comprises a fixed plate 4 and a plurality of pressing heads 3 which are arranged around the center of the fixed plate 4 and are aligned with the splicing bosses A5 of the iron core block A;

the fixing plate 4 is detachably mounted on the upper die base 5, the positioning seat 8 of the positioning device for iron core riveting is detachably mounted on the lower die base 1, and the center of the fixing plate 4 is aligned with the center of the positioning seat 8.

This iron core riveting die, guide pillar 6 and guide pin bushing 7 clearance fit for upper die base 5 plays the guide effect along 6 axial motion of guide pillar to the motion of upper die base 5, guarantees the degree of accuracy of relative position between upper die base 5 and die holder 1. The number of the pressure heads 3 is equal to that of the iron core blocks A forming the motor iron core, and each pressure head 3 is aligned to the splicing boss A5 of the corresponding iron core block A, so that when the upper die base 5 drives the pressure head 3 to press the motor iron core, the splicing bosses A5 are pressed into the corresponding splicing grooves A4 by the aid of the pressure heads 3, the consistency is good, the risk of damaging the motor iron core during riveting is reduced, and the service life of the motor iron core is prolonged; the precision of the motor iron core is improved; and the production efficiency can be greatly improved.

The clamp 9 can be supported on a clamp seat 11, and the clamp seat 11 is connected with the lower die holder 1.

The fixing plate 4 and the upper die base 5 are positioned through a cylindrical pin B2 and are closed through a hexagon socket head cap screw B1.

The specific steps of using the iron core riveting die to rivet a motor stator iron core in a pressing manner are as follows:

firstly, placing each iron core block A between two adjacent indexing blocks 13, and inserting the positioning groove A6 of each iron core block A into the corresponding positioning block 12 to make the iron core blocks A surround the positioning seat 8 to form a circle to form a circular ring;

then, pressing the clamp 9 to drive the expansion and clamping block 2 to tightly hold the iron core block A from the periphery of the ring formed by the iron core block A;

then, driving the upper die holder 5 to press down along the guide post 6, so that the plurality of press heads 3 simultaneously press the splicing bosses A5 into the corresponding splicing grooves A4, and completing press riveting;

and finally, lifting the upper die base 5, loosening the clamp 9 after the upper die base 5 is lifted, separating the expansion clamping block 2 from the motor stator iron core, and taking out the motor stator iron core.

In order to make the point of application of force of each indenter 3 more concentrated, the indenter 3 is a stepped shaft and includes a rivet portion with a reduced diameter at the bottom in the axial direction thereof. In order to reduce the abrasion of the pressure head 3 to the motor stator core, the end face of the riveting part is in a reticulate pattern shape.

Claims (10)

1. The motor iron core is formed by sequentially splicing N iron core blocks (A) at the first position; each iron core block (A) is arc-shaped, along the radial direction of the iron core block (A), one end of each iron core block (A) is provided with a splicing groove (A4), and the other end is provided with a splicing boss (A5) matched with the splicing groove (A4); the N iron core blocks (A) are inserted into the splicing groove (A4) through the splicing boss (A5) to be spliced into a circular ring shape; the method is characterized in that: each iron core block (A) comprises a connecting tooth (A3), a concentric arc-shaped outer yoke part (A1) and an arc-shaped inner yoke part (A2); the outer end of the connecting tooth (A3) is connected with the inner ring of the outer yoke part (A1), and the inner end of the connecting tooth is connected with the outer ring of the inner yoke part (A2); the splicing groove (A4) and the splicing boss (A5) are arranged on the outer yoke part (A1); a positioning groove (A6) which is recessed outwards along the radial direction of the inner ring of the inner yoke part (A2) of each iron core block (A); and the indexing groove (A7) is formed between the adjacent inner yoke parts (A2) of the two adjacent iron core blocks (A).

2. The motor core of claim 1, wherein: two adjacent iron core blocks (A) are spliced to surround a trapezoidal cavity (A8), and the indexing groove (A7) penetrates from the inner ring of the inner yoke (A2) to the cavity (A8).

3. The positioning device for riveting the iron core of the motor iron core according to claim 1, characterized in that: the positioning device comprises an inner ring positioning device for limiting the inner ring of the positioning iron core and an outer ring positioning device for limiting the outer ring of the positioning iron core;

the inner ring positioning device comprises a positioning seat (8), N positioning blocks (12) corresponding to a positioning groove (A6) of the motor iron core and N indexing blocks (13) corresponding to an indexing groove (A7) of the motor iron core; the N positioning blocks (12) are distributed on the positioning seat (8) around the center of the positioning seat (8), and the positioning blocks (12) are matched with the positioning grooves (A6); the N indexing blocks (13) are distributed on the positioning seat (8) around the center of the positioning seat (8), and the indexing blocks (13) are matched with the indexing grooves (A7); the positioning blocks (12) and the indexing blocks (13) are arranged at intervals;

the outer ring positioning device comprises a plurality of expansion clamping blocks (2), the inner end of each expansion clamping block (2) is provided with an arc-shaped groove (2A), the arc-shaped groove (2A) on each expansion clamping block (2) surrounds the center of the positioning seat (8) to form a circular limiting groove matched with the outer ring of the motor core, and a limiting mechanism for limiting the relative position of each expansion clamping block (2) is arranged.

4. A positioning device for iron core riveting according to claim 3, characterized in that: the positioning block (12) is detachably arranged on the positioning seat (8); the indexing block (13) is detachably mounted on the positioning seat (8).

5. The positioning device for iron core riveting according to claim 4, characterized in that: the positioning seat (8) is uniformly distributed with first slots (8A) matched with the positioning blocks (12) along the circumferential direction of the positioning seat, and the positioning blocks (12) are inserted into the first slots (8A);

a second slot (8B) matched with the indexing block (13) is uniformly distributed on the positioning seat (8) along the circumferential direction of the positioning seat, and the indexing block (13) is inserted into the second slot (8B);

the first slot (8A) and the second slot (8B) are distributed at intervals.

6. A positioning device for iron core riveting according to claim 3, characterized in that: the two expansion clamping blocks (2) are separated at two sides of the positioning seat (8).

7. A positioning device for iron core caulking according to claim 3, 4, 5 or 6, characterized in that: the device is provided with a guide rail (10) corresponding to the expansion clamping block (2), a guide groove (2B) matched with the guide rail (10) is formed in the bottom of the expansion clamping block (2), and the guide groove (2B) of the expansion clamping block (2) is in sliding fit with the guide rail (10) along the extension direction of the guide rail (10).

8. The positioning device for iron core riveting according to claim 7, characterized in that: the limiting mechanisms are clamps (9) respectively connected to the outer ends of the expansion clamping blocks (2).

9. Iron core riveting die, its characterized in that: comprises an upper die holder (5), a lower die holder (1), a guide post (6), a press riveting device and a positioning device for iron core riveting according to claim 3 or 4 or 5 or 6;

the guide post (6) is vertically arranged on the lower die base (1);

a guide sleeve (7) matched with the guide post (6) is arranged on the upper die holder (5); the top end of the guide post (6) is inserted into the guide sleeve (7), and the guide post (6) is in movable fit with the guide sleeve (7) along the axial direction of the guide post (6);

the riveting device comprises a fixing plate (4) and a plurality of pressing heads (3) arranged around the center of the fixing plate (4);

the fixing plate (4) is detachably mounted on the upper die base (5), the positioning seat (8) of the positioning device for iron core riveting is detachably mounted on the lower die base (1), and the center of the fixing plate (4) is aligned with the center of the positioning seat (8).

10. An iron core riveting die according to claim 9, wherein: the pressure head (3) is a stepped shaft and comprises a riveting part with the diameter reduced at the bottom along the axial direction, and the end face of the riveting part is in a reticulate pattern shape.

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